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TPS22981RGPR Datasheet(PDF) 10 Page - Texas Instruments |
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TPS22981RGPR Datasheet(HTML) 10 Page - Texas Instruments |
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10 / 27 page  LIMMAX SET 41571 I + 0.0161 A R = LIMMIN SET 38429 I – 0.0161 A R = SET LIMTYP 40 k Amps R I W ´ = -25% -20% 15% 10% -5% 0% 5% 10% 15% 20% 25% 0 50 100 150 200 250 300 350 400 450 RSET_S0/S3/V3P3 (k ) min typ max 0 200 400 600 800 1000 1200 1400 1600 1800 0 50 100 150 200 250 300 350 400 450 RSET_S0/S3/V3P3 (k ) min typ max TPS22981 SLVSBM6B – DECEMBER 2012 – REVISED NOVEMBER 2015 www.ti.com Feature Description (continued) 7.3.2 Current Limit Threshold Figure 3. ILIM vs RSET for VHV and V3P3 Figure 4. % Variance from Minimum ILIM vs RSET Figure 3 shows the minimum, typical, and maximum current limit for either supply versus its corresponding RSET value. Equation 1 is used to determine the RSET needed to set a typical ILIM for a given supply and mode. Figure 4 shows the percent variation from the typical ILIM value to the minimum and maximum ILIM values. SPACE where • RSET = external resistor used to set the current limit for V3P3, VHV (S0), or VHV (S3) • ILIMTYP = typical current limit for V3P3, VHV (S0), or VHV (S3) set by the external RSET resistor. (1) SPACE Each resistor is placed between the corresponding ISET pin and GND, as shown in Figure 2, providing a minimum current limit between 100mA and 1.5A. For a given RSET the minimum current limit and the maximum current limit are determined by Equation 2 and Equation 3. SPACE (2) SPACE (3) SPACE 7.3.3 Maximum Current Limit Threshold The TPS22981 has a maximum current limit ILIMVHVMAX and ILIM3P3MAX. This prevents excessive current in the case of an ISET pin being shorted to ground. 7.3.4 Transition Delays Output transitions of the TPS22981 voltages are shown in Figure 5. When the device transitions from VHV to V3P3 at the output, the power switches both turn off until the output falls to near the V3P3 voltage. During this time, a discharge current of IDIS pulls OUT down. If a load is also pulling current from OUT, the output will drop to near 0 V due to the switch OFF-time of T3P3OFF. 10 Submit Documentation Feedback Copyright © 2012–2015, Texas Instruments Incorporated Product Folder Links: TPS22981 |
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